It looks like ElementTree is a module and not a class. The same error message was posted here few weeks ago. Actually, I discuss it in my Oxford lectures, page 30: see http://www.reportlab.org/~andy/accu2005/pyuk2005_simionato_wondersofpython.zip
(there also everything you want to know about new-style classes and more). Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list